hwaccess: move x86 port I/O related code into own files

Allow port I/O related code to be compiled independent from memory
mapping functionality. This enables for a better selection of needed
hardware access types.

Change-Id: I372b4a409f036da766c42bc406b596bc41b0f75a
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.com>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/60110
Original-Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/72265
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/wbsio_spi.c b/wbsio_spi.c
index dd4bb46..52a8c7d 100644
--- a/wbsio_spi.c
+++ b/wbsio_spi.c
@@ -18,6 +18,7 @@
 #include "chipdrivers.h"
 #include "programmer.h"
 #include "hwaccess.h"
+#include "hwaccess_x86_io.h"
 #include "spi.h"
 
 #define WBSIO_PORT1	0x2e